phocid seals, seal lice and heartworms: a terrestrial host-parasite system conveyed to the marine environment.adaptation of pinnipeds to the marine habitat imposed parallel evolutions in their parasites. ancestral pinnipeds must have harboured sucking lice, which were ancestors of the seal louse echinophthirius horridus. the seal louse is one of the few insects that successfully adjusted to the marine environment. adaptations such as keeping an air reservoir and the ability to hold on to and move on the host were necessary, as well as an adjustment of their life cycle to fit the diving habits of their h ...200718062474
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